What options are available for sending line level sources over long distances (around 100ft). My preferences would be for something that can be sent over inexpensive wire, such as Cat5. A pair of boxes with A/D and D/A that worked over ethernet, telephone lines, or power would be ideal. I am not interested in wireless (900mhz, 2.4ghz) technologies. Low cost is a very big plus. Sound quality doesn't need to be great, something along the lines of inexpensive mass market CD player sound would be fine. Critical listening is done in the living room where I have better equipment.
One option that I am aware of is the Terk Leapfrog. I can't find many reviews about this system though, and having had problems with Terk products in the past I am not too excited about buying more of their stuff.
My goal is to be able to listen to audio from my main stereo in other rooms. Our office and bedroom already have small stereos (JVC FS-2000), and I would just like to be able to select AUX IN on those to listen to stuff from other parts of the house, or use the CD Player/Tuner on those to listen to music independetly. For me this makes more sense then doing house-wide multisource sound, and it should be a lot less expensive.
There are ethernet-connected computers in every room that I care about, so a PC-based software solution using high quality sound cards would be acceptable if it was reliable and had good quality audio.